When using the recently added functionality of honoring context-root in ibm-web-ext (https://github.com/jenkinsci/websphere-deployer-plugin/pull/6) the plugin attempts to extract context-root from said file.

Since in the file the user can write the context root both with a leading slash and without, the plugin attempts to add a leading slash if missing. Such addition is currently performed wrong, since the slash is added at the end of the specified context-root.

The proposed PR (https://github.com/jenkinsci/websphere-deployer-plugin/pull/7) fixes this behavior by correctly adding the slash at the begin of the context-root.